1201999 has 2 divisors, whose sum is σ = 1202000. Its totient is φ = 1201998.

The previous prime is 1201969. The next prime is 1202009. The reversal of 1201999 is 9991021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600999 + 601000.

It is an arithmetic number, because the mean of its divisors is an integer number (601000).

2^1201999 is an apocalyptic number.

1201999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201999 is an equidigital number, since it uses as much as digits as its factorization.

1201999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1201999 is about 1096.3571498376. The cubic root of 1201999 is about 106.3248312521.

The spelling of 1201999 in words is "one million, two hundred one thousand, nine hundred ninety-nine".